Segments (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales:
Net sales	$ 343.8	$ 328.0
Segment operating income:
Total segment operating income	22.2	11.3
Litigation settlement gain	3.3	0.0
Asset impairment charge	0.0	(4.0)
Interest expense	(7.4)	(7.1)
Income before income taxes	14.8	4.2
Operating Segments
Segment operating income:
Total segment operating income	25.5	21.8
Operating Segments | Supply Technologies
Net sales:
Net sales	133.2	129.9
Segment operating income:
Total segment operating income	11.3	10.2
Operating Segments | Assembly Components
Net sales:
Net sales	139.3	131.7
Segment operating income:
Total segment operating income	12.5	10.2
Operating Segments | Engineered Products
Net sales:
Net sales	71.3	66.4
Segment operating income:
Total segment operating income	1.7	1.4
Segment Reconciling Items
Segment operating income:
Corporate costs	(6.6)	(6.5)
Litigation settlement gain	3.3	0.0
Interest expense	$ (7.4)	$ (7.1)